Drawing is alright, but completely would not work as a t-shirt design. I don't know if you're planning on having these made, or use them for a contest or something, but you'll have to reduce the amount of colors you're using. I count 15+ colors. Assuming you find a place that will print a shirt with that many colors, it would be pretty costly for a shirt. If you want to get into t-shirt design, practice limiting your palette to 3-4 colors maximum, including the color of the shirt.